The most difficult mate in 3 on the Lichess puzzle database : r/chess
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mate in 3 – Daily Chess Musings

It took my 5 mins to find this move. Mate in 2. Black to move. Guess the elo. : r/chess

A very difficult Checkmate in 1 puzzle. Good luck! : r/chess

The hardest ever mate in 3 puzzle - Chess Forums

Cool mate in 3 (white to play) : r/chess

5 Hardest Mate-in-3 Ever - TheChessWorld

The Most Useless Puzzle of All Time : r/chess

Sneaky puzzle from The Checkmate Pattens Manual; White to play : r/chess

Found this Beautiful 1900 rated puzzle on lichess. White to move and win material. : r/chess

Brutally difficult M3 from Danya's channel : r/chess

Hard Chess Puzzle # 0068

I composed a reverse puzzle. Stockfish can't find the winning move at depth 50, but a 1000 ELO human can find it in 10 seconds. Black to play and win. : r/chess
What is the hardest mate-in-3 puzzle? - Quora

WHITE to move and MATE IN 3 : r/chess
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